When it comes to the world of beauty, the questions are endless (what’s the best shampoo for less-than-lustrous hair? Do lasers really work? Is there anyone who shouldn’t try a matte red lip?), but now the answers can be found on Twitter, courtesy of Vogue.com’s own beauty director, Catherine Piercy, who will fully take over our feed this Friday, August 16, for one hour starting at 12:00 p.m. EST. Have a pressing beauty query before the weekend starts? Tweet it to @voguemagazine #askcatherine and, within seconds, you’ll have your answer.